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【单选题】
用水平力【图片】把一个物体压着靠在粗糙的竖直墙面上保持静止；当【图片】逐渐增大时，物体所受的静摩擦力【图片】的大小：A.
不为零，但保持不变
B.
随 正比增大
C.
开始随 增大，达到某一最大值后，就保持不变
D.
无法确定
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